Horn for sound-reproducing apparatus



Sept. 14 1926.

D. F. WALKER HORN FOR SOUND REPRODUCING APPARATUS Filed May 12, 1924 Patented Sept. 14, 1926.

UNITED STATES DUDLEY FRANK WALKER, 0F GUILDFORD, ENGLAND.

HORN FOR SOUND-REPRODUCING APPARATUS.

Application filed May 12, 1924, Serial No; 712,815, and in Great Britain July 31, 1923.

This invention relates to horns for sound producing apparatus such as gramophones, phonographs, wireless receiving apparatus, megaphones, organ pipes and the like, and has in view to provide a horn constructed entirely of wood which may be of any do sired curve or shape.

Hitherto, horns have been partly constructed of wood, but it has been found necessary to provide metal connections between the separate portions of which the horn was made, where any bend occurs as it was found impossible to secure together the separate longitudinal pieces in such a fashion as to permit of bending on themselves.

It has been found that the presence of any metal whatsoever on the horn affects the purity of the tone, and according to the present invention, the necessity for any metal parts is eliminated.

In order that the present invention may be the more readily undertsood, the same will now be described and illustrated as applied to a flared loud speaker or horn.

Of the drawings Figure 1 is a sectional plan View of an octagonal horn.

Figure 2 is a fragmentary sectional plan view, drawn to an enlarged scale.

Figure 3 is a fragmentary perspective view of the flared mouth of said horn.

Figure l is a fragmentary sectional view illustrative of a detail hereinafter referred to.

igure 5 is a side view of the complete horn.

Like numerals of reference indicate corresponding parts in the several figures.

In carrying out the invention, the horn consists of eight tapering strips 1 of plywood, arranged with their side edges 2 together as shown in Figure 1, the plywood pieces 1 being all steamed or otherwise treated in known manner to permit the necessary bending thereof.

As the edges 2 are perpendicular with the flat strips 1, it follows that when the strips are arranged together in the above stated fashion, a V-shaped groove 3 exists between the adjacent side edges 2 of the strips 1.

Into each groove 3 thus formed is run a very tenacious liquid glue, that is to say, celluloid liquid cement 4, where it takes up the shape shown in Figure 2, by reason of capillary attraction.

This celluloid liquid cement 4k is allowed to set, and the recess formed in said cement is then filed, under pressure, with an agglutinant plastic wood paste or stopper 5 which contracts and in drying becomeshard, said wood paste 5, when hard, being then smoothed down and varnished, to a similar colour and appearance to the wood strips 1, and in this manner are said wooden strips 1 all drawn tightly together.

lien the shape of the jointed article terminates in an exposed and unprotected edge, as in the case of the front edge 6, see Fig ures 3 and 4., of the flare or mouth of the horn, use is made of a staple or double rivet 8, the same being placed in a recess 7 formed by cutting away part of the center ply of two adjacent strips 1, and driving said staple or rivet 8 into said strips 1, the recess 7 then being filled in with wood paste and finished off smooth.

Any convenient arrangement of jig is employed to hold the strips in the desired form, curved or otherwise, while the above treatment is being carried out, and when the horn or article is removed from the jig, there is no tendency for the strips to come apart.

In the case of a wireless receiving apparatus, a horn 9 constructed in accordance with the foregoing description may be mounted in a socketed portion of a wooden base 10, as shown in Figure 5 of the drawings.

In all cases, three plywood is always used on account of its great strength and ease with which it can be bent under steam, and horns and the like made in accordance with the invention are extremely light in weight, give a clear pure tone, and are cheap to manufacture.

I claim 1. A horn structure comprising sections having edge surfaces perpendicular to their side surfaces, the adjacent sections being disposed angularly with relation to each other and the inner angular edges of the adjacent sections being in close contact with each other and their outer angular edges spaced from each other thereby forming a gap at the exterior of the horn, a coating of glue applied to the edge surfaces of the adjacent sections,said coating of glue partially filling the transverse sectional area of the gap.

2. A horn structure comprising sections surfaces perpendicular to their side sull l (lisp/teed angularly with relation to each other .1 the inner angular edges of the a d adiacent settions being in close contact with each other and their outer angular edges spa CQCl from each other thereby forming a at the exterior of the horn, a coating 01 ie applied to the edge surfaces of the ad in cut sections. said coating of glue part'll.

Iall filling the transverse sectional area of the gap and a filling of agglutinous paste applied to the opposite side surfaces of the glue coating and in conjunction with the glue coating completely filling the gap.

A horn structure comprising sections having edge surfaces perpendicular to their side s laces, the adjacent sections being ditpo l angularly with relation to each other and the inner angular edges of the ad ae-cut sections being in close contact with each other whereby their outer angular eds s are spaced from each other thereby forming a gap at the exterior of the horn, a coating of glue applied to the edge surfaces of the adjacent sections, said coating of glue partially filling the transverse sectional area of the gap, and a staple applied to the end edges of the sections and bridging the gap.

In testimony whereof I have allixed my signature hereto this 5th day of March 192i DUDLEY FRANK WALKER. 

